Cohen, David,  1942 September 28- <br/><br/>
Precalculus with unit-circle trigonometry / 
David Cohen, with Theodore B. Lee, David Sklar. 
 - 4th ed. 
 - Belmont, CA :  Thomson Brooks/Cole,  c2006. 
 - 1 v. (various pagings) :  ill. (some col.) ;  27 cm. +  1 CD-ROM (4 3/4 in.) 
<br/><br/><label>ISBN: </label>0534402305 0534402399 (CD-ROM) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Algebra--Textbooks.<br/>Functions--Textbooks.<br/>Trigonometry--Textbooks.